.w100 {
    width: 100%;
}

.h100 {
    height: 100%;
}

.flex {
    display: flex;
}

.flex-ai-jc-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.pa {
    position: absolute;
}

.pr {
    position: relative;
}
